[单项选择]Mount Rushmore is a national monument located in the Black Hills of South Dakota. Carved into the side of the large mountain are the faces of four men who were the Presidents of United States. These men were chosen because all four played important roles in American history. The four faces carved onto Mount Rushmore are those of George Washington, Thomas Jefferson, Abraham Lincoln and Theodore Roosevelt. Each face carved into the mountain is about 60 feet tall.
George Washington was chosen for this monument because of his role in the Revolutionary War and his fight for American independence. He was the first President of United States and is often called Father of the country. Thomas Jefferson was picked because he believed that people should be allowed to govern themselves, which is the basis for American democracy. Abraham Lincoln was added because he believed that all people are equal, and he helped end slavery in the United States. Theodore Roosevelt was chosen because he wa
A. their importance in the history of the country
B. the time of their presidency
C. the length of time they were in office
D. the number of votes they received to be elected